LP3856ES-3.3 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP3856ES-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this regulator's electrical and mechanical specifications.

Substiute Parts

LP3856ES-3.3

Texas InstrumentsIn Stock: 3283LP3856ES-3.3 Datasheet

Current PartRFQ

LP3856ES-3.3/NOPB

Texas InstrumentsIn Stock: 1149LP3856ES-3.3/NOPB Datasheet

DirectRFQ

LP3853ES-3.3/NOPB

Texas InstrumentsIn Stock: 1379LP3853ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3873ES-3.3/NOPB

Texas InstrumentsIn Stock: 3287LP3873ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3876ES-3.3/NOPB

Texas InstrumentsIn Stock: 6570LP3876ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3963ES-3.3/NOPB

Texas InstrumentsIn Stock: 1286LP3963ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3966ES-3.3/NOPB

Texas InstrumentsIn Stock: 2190LP3966ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3963ES-3.3

Texas InstrumentsIn Stock: 1527LP3963ES-3.3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3856ES-3.3 are classified based on strict electrical and mechanical parameter alignment:

Direct Equivalent (Identical Specifications):

• LP3856ES-3.3/NOPB: Identical electrical performance and package. Differs only in packaging format (Tube vs. unspecified) and product status (Active vs. Last Time Buy).

Parametric Equivalents (Functionally Compatible): Substitute parts maintain the same output voltage (3.3V), output current (3A), input voltage maximum (7V), package type (TO-263 DDPAK-5), operating temperature range (-40°C ~ 125°C), and protection features. Differences exist in the following parameters:

• Voltage Dropout: LP3856ES-3.3 specifies 0.6V @ 3A. Substitutes LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3963ES-3.3, and LP3966ES-3.3/NOPB specify 1.2V @ 3A.
• Quiescent Current (Iq): LP3856ES-3.3 specifies 4 mA. LP3873ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3963ES-3.3, and LP3966ES-3.3/NOPB specify 9 mA. LP3876ES-3.3/NOPB specifies 5 mA.
• Supply Current (Max): LP3856ES-3.3 specifies 10 mA. Substitutes LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3963ES-3.3, and LP3966ES-3.3/NOPB specify 15 mA.
• PSRR: LP3856ES-3.3 specifies 73dB ~ 57dB (120Hz). LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3963ES-3.3, and LP3966ES-3.3/NOPB do not specify PSRR.
• Base Product Number: Varies by part (LP3856, LP3853, LP3873, LP3876, LP3963, LP3966).

All substitute parts maintain RoHS3 compliance, MSL 3 rating, and identical protection features (Over Current, Over Temperature, Short Circuit).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP3856ES-3.3/NOPB

This part is the direct equivalent of the main part number, offering identical electrical specifications and the same TO-263 package. It maintains Active product status, ensuring long-term availability and supply chain stability. The /NOPB suffix indicates lead-free, RoHS3-compliant packaging in Tube format. This is the preferred substitute when the original LP3856ES-3.3 reaches end-of-life.

Secondary Recommendation: LP3853ES-3.3/NOPB

This part matches the electrical performance of LP3856ES-3.3 exactly, including the 0.6V dropout voltage and 4 mA quiescent current. It is Active status with adequate inventory (1356 Pcs). Selection of this part requires verification that the base product number change (LP3853 vs. LP3856) does not conflict with design documentation or procurement specifications.

Alternative Recommendations for Higher Dropout Voltage Applications: LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3966ES-3.3/NOPB

These parts are suitable for applications where the increased voltage dropout (1.2V @ 3A) is acceptable. All maintain the 3.3V output, 3A current, and TO-263 package. Selection depends on quiescent current requirements:

• LP3876ES-3.3/NOPB: Lowest quiescent current (5 mA) among higher-dropout alternatives. Highest inventory availability (6460 Pcs).
• LP3873ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3966ES-3.3/NOPB: Higher quiescent current (9 mA). All are Active status.

Avoid: LP3963ES-3.3 (without /NOPB suffix)

This part is in Last Time Buy status, similar to the original LP3856ES-3.3. It does not provide supply chain continuity and should not be selected as a long-term substitute.

All recommended parts are RoHS3 compliant with MSL 3 rating and identical protection features (Over Current, Over Temperature, Short Circuit).

Frequently Asked Questions (FAQ)

Q: Can LP3856ES-3.3/NOPB be used as a direct replacement for LP3856ES-3.3?

A: Yes. LP3856ES-3.3/NOPB is electrically and mechanically identical to LP3856ES-3.3. The differences are packaging format (Tube) and product status (Active vs. Last Time Buy). Both are RoHS3 compliant with identical electrical specifications.

Q: What is the difference between LP3856ES-3.3 and LP3853ES-3.3/NOPB?

A: Both parts have identical electrical specifications: 3.3V output, 3A current, 0.6V dropout @ 3A, 4 mA quiescent current, and 73dB ~ 57dB PSRR. The primary difference is the base product number (LP3856 vs. LP3853). Both use the same TO-263 package. Substitution is valid if design documentation does not restrict the base product number.

Q: Why do some substitute parts have higher voltage dropout (1.2V vs. 0.6V)?

A: Voltage dropout is an inherent characteristic of the regulator design. Parts with 1.2V dropout (LP3873, LP3876, LP3963, LP3966 series) are different IC designs. They are suitable only if the application's input voltage headroom accommodates the higher dropout without violating minimum input voltage requirements or causing output voltage regulation failure.

Q: Are all substitute parts in the same TO-263 package?

A: Yes. All listed substitute parts use the TO-263 (DDPAK-5) package with 5 leads plus tab. PCB layout and thermal management considerations remain identical across all parts.

Q: What does the /NOPB suffix mean?

A: The /NOPB suffix indicates lead-free, RoHS3-compliant packaging without lead (Pb). It is the standard designation for compliant components. The main part LP3856ES-3.3 does not include this suffix in the provided data but is still RoHS3 compliant.

Q: Which substitute part has the best inventory availability?

A: LP3876ES-3.3/NOPB has the highest inventory (6460 Pcs). It also offers a moderate quiescent current (5 mA) among the higher-dropout alternatives, making it a practical choice for high-volume procurement when the 1.2V dropout is acceptable.

Q: Can I use LP3963ES-3.3 (Last Time Buy) as a substitute?

A: LP3963ES-3.3 is in Last Time Buy status, indicating end-of-life production. It does not provide long-term supply chain continuity. Active status parts (LP3856ES-3.3/NOPB, LP3853ES-3.3/NOPB, LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3966ES-3.3/NOPB) are preferred for new designs and long-term applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts, including the main part LP3856ES-3.3, are RoHS3 compliant. All carry MSL 3 rating (168 Hours) and identical protection features (Over Current, Over Temperature, Short Circuit).